Soot cleaner for boilers



-F6114, 1930. LHARTER V1,745,484

SOOT CLEANER FOR BOILERS Filed June 18, 192:',v

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Patented Feb. 4, A193e j A =.UNITED STATES PATENT ePrice HARTER, 0F DONOiAN HILLVS, NEW YORK, ASSIGNOR TO THE BABCOCK & WILCOX f Y vFy VBAYONNE, NEW JERSEY, A CORPORATION Olr` NEW JERSEY soorr CLEANER non BorLERs VApplication fusa June 1s,

plain jet openings through which fluid under pressure is ejected for the purpose of cleaningfsoot from boiler tubes. Tubes commonly employed for thispurpose, however, are not of sufficient thickness to form a satisfactory jet opening. Furthermore, the material from which such tubes are made is necessarily comparatively soft, with the result that the v high pressure fluid ejected from the jet openings quickly erodes the -wall surrounding the openings, thereby destroying the utility of the tubes. In anattempt to overcome this difficulty, the soot-blowing element has been provided 'with small tubular members conf stituting nozzles connected to openings'in the tubes and projecting therefrom. Such an arrangement makesan unsymmetrical device. The heat radiation from the projecting nozzles is, of course, different from the tubular members, with the result that this unsymmetrical arrangement results in creatingl in the tubular membery different temperatures around the element, ywhich results in undue Vwarping of the device.

Inaccordance with my invention, the fore# vgoing difficulties are overcome by the provision yof a soot-blowing element which is symmetrical, as respects 'its outer surface,

about the axis of the element, thereby producing uniform temperatures aroundthe element. i

`My invention willbest befunderstood by vreferenceto the accompanying drawings, in

which I have illustrated a number of forms of myinvention, and in which Figure 1 is a vertical cross-section taken through a steamA boiler with the 'soot-blowing element embodyf ing :my invention located above the boiler tubes; Fig. 2 is a fragmentary section, partially iny elevation, illustrating one form of soot-blowing element made kin accordance with my invention; Fig., 3 is a side view of Figp2; Fig. 4 is alongitudinalt sectionk through afporton of a soot-blowing element,

' illustrating a modied form of my invention;

ig. 5 is a cross-section through Fig. 4*; Fig. 6 is afsectional view of a soot-blowing element embodyinga still further moditledk form of known manner.

1923. Serial No. 646,031.

ysteam and water drums of a double boiler in connection with which I have illustrated my invention, and 1l are Water tubes in staggered arrangement from top to bottom presenting aisles 12-through which a cleaning fluid may pass. The setting of the boiler is indicated generally at 13. A soot-blowing element, indicated generally at 14, is located above the water tubes and passes through an opening 15 in one of the side walls, fluid under pressure, such as steam, being supplied to the soot-blowing element by a pipe 16.V In the form shown, the soot-blowing element is rotated by a grooved wheel 17, over which passes an operating chain 18. An air-tight joint is formed between the pipe 16 and the soot-blowing element 14 at 19, which permits rotaryfmovement of the soot-blowing element relatively to the supply pipe in a well The soot-blowing element comprises sections kof pipe 20, preferably separately formed and screw-threaded at their ends, as at 21, they adjacent ends of two sections being connected by a separately formed cylindrical section 22, which, in the form shown in Figs. 2 and 3, is formed with a wall'sutficiently thick and of a material sufliciently hard so that a jet opening 23 may be formed directly in the wall of the section 22 without 'its being subjected to excessive erosive action of the iiuid under pressure which is ejected therefrom. The sootblow ing element is preferably supported on the upper 4row of` boiler tubes by brackets 24, provided with openings 24@ through which the soot-blowing element passes, each bracket 24 being clamped toone'of' the boiler tubes by a strap 25 and by -suitable nuts 26, as best shown in Fig. 2. Y

In 4the form of my invention illustrated in Figs. 4 and 5, the walls of the section 22a are extent as in the arrangement shown in Fig.

2. The section 22a is preferably generally elliptical, as best shown in Fig. 5, and one portion thereof is provided with a cupshaped recess 27 in which is received a member 28 formed of erosion-resisting material and is provided with a jet opening 29 registering with an opening 30 formed in the member 22a.

In the form shown in Fig. 6, the walls at one side ofthe member 221k arek thickened,

.f as at 3l, and provided with a cup-shaped recess 32 in which isreceived a member similar to the member 28 shown and described in connection with Fig. 4, and 'whichneeds no further description.

In the arrangement illustrated in Fig. 7,

the intermediate section 22c is provided with l an opening 33, preferably slightly inclined inwardly, in which is received a member 84 formed of hardened material and extending `inwardly past the wall of the member 22,

the vmember 34 extending outwardly, flush with the outer surface of the memberV 22E.v

By confining the jet openings within the outer surface of the tubular element, andv forming the element as described, the jet openings are surrounded by walls thicker than the normal thickness of the tubular walls of the element, and the exterior outline of any crossfsection through the element, and at right angles to the axis thereof, is symmetrical with reference to the axis of said element.

When the soot blowing element is made practically symmetrical about its axis, and the Venturi nozzles kept substantially or entirely inside of the enlarged part of the ele ment pipe in which the nozzle is formed, as f illustrated, the tendency of the elementfto Warp is very much lessened.

`By forming the inner orifices of the 'jet openings outside of the interior surface of the tubular members 20, as illustrated, there are no parts which project -into the interior of the tubular element to obstruct the flow of steam. Furthermore, the outer orifices of the jet openings are preferably located outside of the outer surfaces of the tubular elements.

Should there be any tendency of the nozzle pieces -22 to loosen, the same may be welded to the adjacent ends of the pipe sections 20 by autogenous Welding, as at 35 in Fig. 8. Furthermore, the nozzle pieces may, if de.-

r sired, be forced over the outside of` aV conf tinuous pipe, the nozzle pieces welded to the pipe by autogenous Welding, and the orifices expand outwardly with walls having 4a great.-

er depth or thickness than the normal thickness of the soot-blowing element, and by confining the outer portions and the inner'por tions of the openings or nozzles within the outer and inner portions of the element, no projections are formed outside of the element which would become heated by the hot gases to which it is subjected, thereby causing.'

warping of the element, and no projections are formed inside of thek element which would interfere with the flow of steam through the element.

I claim l. A tubular `soot-blowing element com- I prising alined tubular sections connected by shorter tubular` vsections thicker than and concentric with the first, the shorter sectollS,y

only being provided with jet openings freely exposed to the space surrounding said elef' ment, said' openings being surrounded by walls of greater depth than the normal thick.-

ness of thev walls of the first-mentioned sec: tions, the exterior outline `of any cross-section through said elementatvright angles to the axis thereof being substantially lsymmetrical with reference to the axis of said element.

2. A tubular soot-blowing element comprise ing alined tubular sections connected by shorter tubular sections having a greater diameter and walls of greater depththan ,those of the first named sections and provided with jet openingsY freely exposed to the space suri-V rounding said element, the exterior outline of any cross section through said element at right angles to the axis thereof being substantially symmetrical with reference to the axis openings being located outside ofthe inner surface of the major portion of `said tubular element.

.4. .A tubular soot-blowing element compris? ing alined tubular sections connected by n shorter tubular sections having 4a greater ,di-A ameter and walls of greater depth than those jet openings freely exposed to the space surroundi-ng said element, the exterior `outline of ,any cross section through said element at right angles to the axis thereof being sub# stantially symmetrical with reference to the axis of said element,.the inletsY of said open.-

ings being located outside of the 'inner surface of the major -portion of said tubular element and the .outlets of said :openings be,-

V` of the first named sections and provided with Y ing located flush with the outer surfaces of .said tubular element.

5. A tubular soot-blowing element having jet openings in the formof outwardly expanding nozzles spaced along its length, said nozzles being located in enlarged parts of the element and inside oi" the exterior thereof, the exterior outline of anycross section through said element at right-angles to the axis thereof being substantially symmetrical with reference to the axis of said element, the inlets rof said nozzles being located outside ofthe inner surface of said element. n

6. A tubular soot-blowing element having outwardly expanding jet openings spaced along its length, said jet openings being 1ocatedin enlarged parts of the element and surrounded by walls thicker than the normal thickness of the walls of said element, the

y exterior outline of any cross section through said element at right-angles to the axis thereof being substantially symmetrical with reference to the axis of said element.

7. A tubular soot-blowing element having outwardly expanding jetv openings spaced ralong said element and surrounded by walls f Voi greater length than the normal thickness of the walls of the tube, the outlets and inlets of said openings being confined within the outer and inner surfaces, respectively, of said tubular element, the exterior outline of any cross-section through saidv element at right angles tothe axis theroitl being substantiallysymmetrical with reference to the y axis of said element, and means for rotating said element.

I 8. yA tubular soot-blowing element having jet openings spaced along said element and surounded by walls of greater depth than the normal thickness of the walls of the element, the outlets and inlets of said openings being confined within the outer and inner surfacesrespectively of said tubular element.

, 9. A tubular soot-blowing element comprising alined tubular sections connected by shorter tubular sections thicker and of greaty er diameter than the ilrst and concentric therewith, the shorter sections only being pro- ,l y* vided with outwardly expanded openings surrounded by walls of greater thickness than the normal thickness of the walls of the first mentioned sections, the exterior youtline of any cross section vthrough said element at right angles to the axis thereof being substantially symmetrical with reference to the axis of said element.

n ISAAC HARTER.

CERTIFICATE OF CORRECTION.

Patent No. 1,745,484. Granted February 4, 1930, to

ISAAC HARTER.

It is hereby certified that 4error appears in the printed specification of the above numbered patent requiring correction as follows: Page 3, line 27, claim 7, for the word "length" read "depth"; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 8th day of April, A. D. 1930.

M. J. Moore, (Seal) Acting Commissioner of Patents. 

